linux-kernel - Re: [patch 21/32] NTB/msi: Convert to msi_on_each

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Message-ID: <87h7bs841k.ffs@tglx>
Date:   Wed, 01 Dec 2021 21:26:47 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Jason Gunthorpe <jgg@...dia.com>
Cc:     Logan Gunthorpe <logang@...tatee.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Marc Zygnier <maz@...nel.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Megha Dey <megha.dey@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, linux-pci@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jon Mason <jdmason@...zu.us>,
        Dave Jiang <dave.jiang@...el.com>,
        Allen Hubbe <allenbh@...il.com>, linux-ntb@...glegroups.com,
        linux-s390@...r.kernel.org, Heiko Carstens <hca@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>, x86@...nel.org
Subject: Re: [patch 21/32] NTB/msi: Convert to msi_on_each_desc()

On Wed, Dec 01 2021 at 14:47, Jason Gunthorpe wrote:
> On Wed, Dec 01, 2021 at 07:37:32PM +0100, Thomas Gleixner wrote:
>> I picked that because it _is_ already used to establish the connection
>> to the switchtec_class NTB driver which is beyond the usual cdev muck.
>
> IMHO that is also a misuse. These days two drivers should be hooked
> together using an aux device, not a cdev and the obscure
> class_interface stuff. Aux device supports auto probing and module
> auto loading for instance.
>
> An interrupt on an aux device is at least somewhat conceptually
> parallel to an interrupt on a mdev as both are usually representing
> some slice of a device.

No argument about that.